Myself and a colleague are planning to self-study for at least one of the ISTQB Advanced exams (we are experienced testers and took the Foundation some time ago).

Can anyone recommend the best materials to buy. Would it be enough to get the package from Universal Exams? Or would we need books (e.g. the ones by Rex Black) as well?

We really need sample questions so I don't think the books alone would be enough, and I haven't found anywhere else to buy questions.

Many thanks for any advice.